Question: What are the active ingredients of the pharmaceutical product niacin
Paraphrase: What are the pharmaceutical niacin's active ingredients?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P3781 wd:Q134658 . ?sbj wdt:P31 wd:Q28885102 } 
Answer: Niaspan, B3-500-Gr, Niacor